Drug interactions
Magnesium sulphate + Minocycline
Severity: Moderate
Magnesium sulphate and Minocycline: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Oral magnesium salts bind tetracyclines in the gut and reduce their absorption, which can lead to subtherapeutic antibiotic levels and treatment failure. The interaction is relevant only when both are given orally.
What this interaction means in plain words
Magnesium sulphate and Minocycline can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Magnesium sulphate belongs to Cardiovascular; Minocycline belongs to Anti Bacterial.
Why it happens
Chelation of minocycline by divalent magnesium cations in the gastrointestinal tract, forming poorly absorbed complexes.
What to do
Give minocycline at least 2 hours before or several hours after oral magnesium. Intravenous magnesium does not need separation.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Magnesium sulphate
- Amikacin + Magnesium sulphate Moderate
- Amphotericin b deoxycholate + Magnesium sulphate Moderate
- Atracurium + Magnesium sulphate Moderate
- Baloxavir marboxil + Magnesium sulphate Moderate
- Ciprofloxacin + Magnesium sulphate Moderate
- Cisatracurium + Magnesium sulphate Moderate
Other interactions of Minocycline
- Acitretin + Minocycline Contraindicated
- Isotretinoin + Minocycline Contraindicated
- Cholera vaccine + Minocycline Major
- Methoxyflurane + Minocycline Major
- Minocycline + Palovarotene Major
- Minocycline + Pexidartinib Major
Frequently asked questions
Can I take Magnesium sulphate with Minocycline?
MediHelp rates the interaction as moderate. Magnesium sulphate and Minocycline can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Oral magnesium salts bind tetracyclines in the gut and reduce their absorption, which can lead to subtherapeutic antibiotic levels and treatment failure. The interaction is relevant only when both are given orally.
How serious is the interaction between Magnesium sulphate and Minocycline?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give minocycline at least 2 hours before or several hours after oral magnesium. Intravenous magnesium does not need separation.
What other medicines interact with Magnesium sulphate?
MediHelp also lists interactions of Magnesium sulphate with, for example, Amikacin, Amphotericin b deoxycholate, Atracurium. The full list is on the Magnesium sulphate page.
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